I did it now through an remote X session, and xlock displays
nicely locally without setting any export DISPLAY,

xlock + does not not display anything, only it's command line. Is this a problem ?

It fails as before on unzip command, it can't find it
Preparing to launch Oracle Universal Installer from /tmp/OraInstall2009-07-07_11-52-53AM. Please wait ...sh: /oracle/u01/app/oracle/database/install/unzip: not found

WARNING: A new inventory has been created in this session. However, it has not yet been registered as the central inventory of this system.
To register the new inventory please run the script '/oracle/u01/app/oraInventory/orainstRoot.sh' with root privileges from another window and then return to this window.
If you do not register the inventory, you may not be able to update or patch the products you installed.The following configuration scripts need to be executed as the "root" user.
#!/bin/sh
#Root script to run
/oracle/u01/app/oraInventory/orainstRoot.sh
/oracle/u01/app/oracle/product/11.1.0/db_1/root.sh
To execute the configuration scripts:
1. Open a terminal window
2. Log in as "root"
3. Run the scripts
4. Return to this window and click "OK" to continue
INFO:
*** End of Installation Page***
The installation of Oracle Database 11g was successful.
WARNING: Do you really want to exit?
INFO: User Selected: Yes/OK

WARNING: A new inventory has been created in this session. However, it has not yet been registered as the central inventory of this system.
To register the new inventory please run the script '/oracle/u01/app/oraInventory/orainstRoot.sh' with root privileges from another window and then return to this window.
If you do not register the inventory, you may not be able to update or patch the products you installed.The following configuration scripts need to be executed as the "root" user.
#!/bin/sh
#Root script to run
/oracle/u01/app/oraInventory/orainstRoot.sh
/oracle/u01/app/oracle/product/11.1.0/db_1/root.sh
To execute the configuration scripts:
1. Open a terminal window
2. Log in as "root"
3. Run the scripts
4. Return to this window and click "OK" to continue
INFO:
*** End of Installation Page***
The installation of Oracle Database 11g was successful.
WARNING: Do you really want to exit?
INFO: User Selected: Yes/OK

Please execute the above scripts from root user.

Thanks

I did that when I installed. But it seems that tnsnames.ora
had to be manually created in order for tnsping to work.

Now I installed the software that uses oracle as database and
there is a script that creates a backup, and the backup
stops at this point